无机材料学报2026，Vol.41Issue(5)：637-644,中插11,9.DOI:10.15541/jim20250348
Fe3+增强氢氧化钙固硫效率:氧化、催化双重机制
Enhanced Sulfur Fixation Efficiency of Calcium Hydroxide by Fe3+:Dual Mechanisms of Oxidation and Catalysis
摘要
Abstract
Sulfur dioxide(SO2)is a major air pollutant that poses severe hazards to environment and human health.Currently,calcium hydroxide(Ca(OH)2)is widely used as a common desulfurizing agent due to its simple preparation process,low cost and relatively good desulfurization performance.However,how to further improve its sulfur fixation efficiency remains unknown.Here,a novel calcium-iron desulfurizing agent was prepared in a stepwise manner by incorporating ferric hydroxide during hydration process of calcium oxide(CaO),and then its desulfurization performance was investigated.The results demonstrated that sulfur fixation efficiency of the calcium-iron desulfurizing agent was significantly enhanced,increasing by 26.16%compared to the maximum sulfur fixation efficiency of pure Ca(OH)2.Addition of Fe3+modified the morphology of Ca(OH)2,rendering its surface much rougher with an increasing of pores and cracks.This morphological change provided more active sites for the desulfurization reaction.X-ray photoelectron spectroscopy analysis revealed that after desulfurization the proportion of hexavalent sulfur(S6+)in the sample increased from 9.71%(pure Ca(OH)2)to 33.33%(calcium-iron desulfurizing agent).Experiment study revealed that before desulfurization,all iron in the calcium-iron desulfurizing agent was in the form of Fe3+,but after desulfurization,Fe2+amazingly accounted for 68.42%while Fe3+only accounted for 31.58%of the total calcium-iron agent.Calculations based on these data indicated that 35.56%sulfur was oxidized while 64.44%was catalyzed.These calculation findings confirmed that oxidation and catalytic effects of the iron promoted the conversion of tetravalent sulfur(S4+)to S6+,thereby further improving the sulfur fixation efficiency.This study provides a promising approach to enhance the sulfur fixation efficiency of Ca(OH)2 and an effective material for removing sulfur dioxide from industrial flue gas.关键词
二氧化硫/氢氧化钙/钙铁脱硫剂/固硫效率/氧化/催化Key words
sulfur dioxide/calcium hydroxide/calcium-iron desulfurizer/sulfur fixation efficiency/oxidation/catalysis分类
通用工业技术引用本文复制引用
李中意,刘彪,陈茜,李春忠,姜海波..Fe3+增强氢氧化钙固硫效率:氧化、催化双重机制[J].无机材料学报,2026,41(5):637-644,中插11,9.基金项目
国家自然科学基金(22578118,22278136,U22B20143) （22578118,22278136,U22B20143）
中央高校基础研究基金(222201718002)National Natural Science Foundation of China(22578118,22278136,U22B20143) （222201718002）
Fundamental Research Funds for the Central Universities(222201718002) （222201718002）
